Doped Titanoniobate And Its Application Of Photocatalytic Materials

Inorganic layered compounds are a new type of photocatalysts with unique properties. Between laminates and interlayer ions has electrostatic interaction, which makes the the two-dimensional layer board stacked into a three-dimensional structure along lengthwise. It owns unique properties, such as ion-exchangeability of interlayer and using as layer pillared target products etc. Simultaneously, treated with layers deposition, electrophoretic deposition and techniques of electrostatic self-assembly, the two-dimensional nanosheets obtained by peel off inorganic layered compounds using organic amines will show a much wider application prospects. Futhermore, inorganic layered compounds have great potential in issues of providing energy and governoncing environmental, therefore more and more attention is paied.High-temperature solid-phase method was reported to synthesis classic inorganic layered semiconductor catalytic material KTiNbO5in this paper. Urea as a nitrogen source, continued to use solid-phase synthesizing nitrogen-doped KTiNbO5. Traditional routines-ion exchanging and stripping-were used to modify layered compounds. Structure and physicochemical properties of the catalyst were characterized by powder X-Ray diffraction(XRD), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), Laser Raman spectroscopy (LRS), X-Ray photoelectron spectroscopy (XPS), HR-Transmission Electron Microscopy-Energy Dispersive X-ray spectroscopy (HR-TEM-EDX), Fourier transform infrared (FT-IR) spectroscopy. Photocatalytic properties of doping materials were investigated by photocatalytic oxidation degradation ethyl mercaptan.The results show that KTiNbO5has clear layered structure and the doped catalyst remains good crystalline and its lamellar structure. Titanoniobate was synthesised at different temperature and different amount of nitrogen-doped case. Then explored the form of nitrogen-doped in the crystal lattice and the doping process, observed the skeleton structure of inorganic catalytic materials and response to light, analyzed the surface morphology and internal state. Preliminary results reveal that both interstitial nitrogen atoms and substitutional nitrogen atoms-are in the lattice.The as-prepared layered compound KTiNbO5was acidified, and titanium niobate HTiNbO5was obtained, the substance remained original layered structure, while layered spacing decreased due to the small iron radius of H+. After adding TBAOH, positive and negative charge neutralized, and larger organic amine cation stretched laminates, then nanosheets were obtained. However, it is difficult to overcome the interaction between layers of nitrogen-doped catalytic materials, so further exploring for new conditions is greatly needed.Nitrogen-doped titanium potassium niobate adopted ethanethiol under static and dynamic conditions, and degraded in the UV and visible light. Each of the modified catalysts showed a catalytic activity. Combined with different effects of various catalysts arising, derived that amount of nitrogen doping and particle size will affect the catalytic activity. Simultaneously paramagnetic isolated nitrogen atom is start switch of photocatalytic oxidation.